How to make original full-pass image from separate passes?
First I encourage you to use image layer instead of render layer, because otherwise you will have to render the scene each time you open up Blender. It could be quite disappointing for very complex scenes. For doing so you need to save your image with all the passes by using the OpenEXR Multilayer

Now for the exact recipe (as illustrated on old the blender manual) 



Finally, I don't see the Diffuse and the glossy passes (D/I/C). You should check them before rendering as shown on this image



I hope this is helpful and Good luck!